6 Remove the fillet from the fridge and allow to come to room temperature.
7 Put a baking dish with 2 tablespoons of oil into the oven, set on high. Once the tray is well heated, carefully roll the fillet in the hot oil, close the oven door and cook for 5 minutes before reducing the heat to medium.
8 Cook a further 10 minutes and then remove the fillet from the oven, cover and allow to rest for at least 10 minutes.
9 Slice the meat into portion size.
10 Add any juices from the resting to your warm sauce. Bring this sauce up to a boil, take off the heat and swirl in a knob of butter.
11 On warm dinner plates, make a bed of kumara purée and arrange the asparagus. Place the fillet slice on top of the kumara and be liberal with the whiskey jus. Any extra can be served in a warm gravy boat on the table.